Metal-tempering compound.



UNITED STATES PATENT @FFKCE.

AXEL S. CARLSON, OF DENVER, COLORADO.

IKCEETAL-TEMPERING COMPOUND.

No I rawing.

To all whom, it may concern Be it known that I, AXEL S. CARLsoN, a citizen of the United States, residing at the city and county of Denver and State of Colorado, have invented a certain new and useful hiletal-Tempering Compound; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to a metal tempering compound, the same being more especially intended for. tempering tools made of steel, such as reamers, drill steels, taps and springs. This compound will prevent the most delicate tools from cracking and its effect is not only to harden but to toughen the material of which the tools are composed.

My compound consists of a mixture of kerosene and creosote preferably in the proportions of ten gallons of kerosene to one gallon of creosote. These ingredients are simply mixed together whereby a homogeneous compound or composition is formed which is at all times ready for use for tempering purposes.

When the tools to be tempered only require that their points shall be treated or a portion extending a short distance from their cutting extremities, these extremities are simply plunged into the liquid and supported at the necessary depth for tempering purposes. Again, if the entire article requires tempering, it is submerged in the compound. In either case the part to be tempered is left in the compound a sutlicient length of time to enable it to cool. The article to be treated or tempered is heated before subjecting it to the treatment. Where Specification of Letters Patent.

Patented. Nov. 13, 1917.

Application filed February 3, 1917. Serial No. 146,491.

the steel is of high quality, the temperature to which it is raised should be somewhat less than where the steel is of lower grade. In other words, the lower grade tools require to be heated to a somewhat higher temperature than the tools composed of the higher grade steel. Generally speaking, good results may be obtained by heating the part to be treated until it is raised to what may be termed a cherry heat.

While I prefer to form the compound of the two ingredients mixed in the proportions stated, it must be understood that these proportions may be varied somewhat without materially interfering with the result obtained, though in my experience with the compound, li prefer the proportions stated, although it must be understood that the invention is not limited to these precise proportions, but is sufliciently comprehensive to include a compound composed of these ingredients and which will produce good results of the character heretofore indicated.

Having thus described my invention, What I claim is:

1. A compound adapted for use in tempering metals and composed of kerosene and creosote mixed together in suitable proportions substantially as described.

2. A tempering compound composed of kerosene and creosote mixed in the proportions of approximately ten gallons of kerosene to approximately one gallon of creosote.

In testimony whereof I affix my signature, in presence of two witnesses.

AXEL S. CARLSON.

Witnesses:

A. J. OBRIEN, A. Ennnr OBRIEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

